HOTS Science Primary 6 Interactions

A car is traveling on a highway. When the driver applies the brakes, the car skids on a wet patch. Why is the stopping distance LONGER on a wet road than a dry one?

A The water acts as a lubricant and reduces friction.
B The water increases the mass of the car.
C The force of gravity is weaker on wet roads.
D Air resistance is higher when it is raining.
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Worked Solution

Step 1: Friction is the force that stops the car's motion when brakes are applied. Step [2-9]: Water on the road acts as a lubricant, filling the tiny gaps in the surface. Step [2-9]: This reduces the grip (friction) between the tires and the road, increasing the distance needed to stop.

Correct answer: The water acts as a lubricant and reduces friction.

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